ORS 538.140

In order to maintain, increase and perpetuate game fish and game fish propagation within Oregon, the waters or use of the waters of Diamond Lake and its tributaries situated in Douglas County shall not be diverted, interrupted or appropriated for any purpose whatsoever, except for domestic use on contiguous and surrounding land or other water uses necessary to maintain, increase and perpetuate game fish and game fish propagation in Diamond Lake and its tributaries.